JPW ML710

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Daniel Quinn
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Re: JPW ML710

Unread post by Daniel Quinn »

that is unusual , that is a 3650 HZ frequnecy overlap in the most sensitive mid range frequencies , RFC would have a heart attack .

thats measurements for you ;)

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Macca
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Re: JPW ML710

Unread post by Macca »

It would depend on what level the drivers are operating at. The tweeter will probably be way down in level at 350 Hz, likewise the mid-bass at 4Khz.

The USP of these seems to be the phase coherence but if you simplify the xovers you're going to lose that property.

Daniel Quinn
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Re: JPW ML710

Unread post by Daniel Quinn »

stop being unnecessarily pedantic , if they have any output at all between 350 hz and 4k then it is still an overlap , but i take your point ;) .

The bass driver goes up to 4k with a x-over , ripe for doping that it is :lol:

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istari_knight
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Re: JPW ML710

Unread post by istari_knight »

Crossovers are 3rd order 18dB/octave so yes, steep slopes.

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Dr Bunsen Honeydew
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Re: JPW ML710

Unread post by Dr Bunsen Honeydew »

I am still waiting for someone to take the stuffing out of their speaker *ANY SPEAKER* and post here (or anywhere) that they have put it back in because it sounds crap.

I will give you another example that in fact led me to this epiphany in the early 1980's (yes I have kept it to myself that long, though I might have told Jimminy Hughes and forgotten :mrgreen: ). Quad 57s have wadding like carpet underlay behind the drive plates. Remove it and the speaker really sings and opens up.

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istari_knight
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Re: JPW ML710

Unread post by istari_knight »

Macca wrote:The USP of these seems to be the phase coherence but if you simplify the xovers you're going to lose that property.
Trust me, I won't be doing anything irreversible with these... To be honest I'm scared of cocking them up they're so well balanced as is. I now completely understand where you were coming from when I was urging you to mod the Akai's and you weren't having any of it :grin:
Dr Bunsen Honeydew wrote:I am still waiting for someone to take the stuffing out of their speaker *ANY SPEAKER* and post here (or anywhere) that they have put it back in because it sounds crap.

I will give you another example that in fact led me to this epiphany in the early 1980's (yes I have kept it to myself that long, though I might have told Jimminy Hughes and forgotten :mrgreen: ). Quad 57s have wadding like carpet underlay behind the drive plates. Remove it and the speaker really sings and opens up.
Aye, it only takes 5 minutes and is 100% reversible. If you don't like it just put it back how you found it ! The first one's I tried it on were a pair of Goodmans Magnum SL's with that thick yellow mattress foam inside, now that really does kill the sound.

AshM750.
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Re: JPW ML710

Unread post by AshM750. »

Dr Bunsen Honeydew wrote:I am still waiting for someone to take the stuffing out of their speaker *ANY SPEAKER* and post here (or anywhere) that they have put it back in because it sounds crap.

I will give you another example that in fact led me to this epiphany in the early 1980's (yes I have kept it to myself that long, though I might have told Jimminy Hughes and forgotten :mrgreen: ). Quad 57s have wadding like carpet underlay behind the drive plates. Remove it and the speaker really sings and opens up.
Might try it With the Ruark Talismans tomorrow ;)

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istari_knight
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Re: JPW ML710

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I've been thinking about mass loading the cabinet walls... We know steel works well but are there any other perhaps more inexpensive materials we can utilise for the same purpose ? Steel lining a 7L cabinet is one thing but a 40L cabinet is something entirely different !

What immediately sprang to mind was ceramic floor tiles, they are heavy and relatively cheap [£6.40 for a pack of eight 400x400x8mm at B&Q currently]. Using these would increase cabinet weight by at least 15kg... Just a thought :think:

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southall-1998
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Re: JPW ML710

Unread post by southall-1998 »

James, how do you sleep at night man :mrgreen:

S.
Shane Lonergan.

Daniel Quinn
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Re: JPW ML710

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istari_knight wrote:I've been thinking about mass loading the cabinet walls... We know steel works well but are there any other perhaps more inexpensive materials we can utilise for the same purpose ? Steel lining a 7L cabinet is one thing but a 40L cabinet is something entirely different !

What immediately sprang to mind was ceramic floor tiles, they are heavy and relatively cheap [£6.40 for a pack of eight 400x400x8mm at B&Q currently]. Using these would increase cabinet weight by at least 15kg... Just a thought :think:
I have used these in my wharfedales and they are now in the family room , they were expensive kitchen tiles but we had loads left over . very hard cermaic and very heavy with a shiny white surface .

I figured that as they a had glossy glaze it would be the same a steel plate :lol:

the doc may have other ideas ;)

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